Shares of four companies — Larsen & Toubro, Bharat Petroleum Corp, City Union Bank and GPT Infraprojects — will turn ex-bonus on Thursday. For investors wishing to receive the bonus shares, Wednesday is the last date to buy these companies’ shares. L&T and BPCL will give one share for every two held in their companies; GPT shareholders will receive one bonus share for each share held; and CUB is giving one share for every 10 shares held in the bank.